Ford Focus ST Forum

Air Filter

Thread: Air Filter

  1. READER84's Avatar

    READER84 said:

    Air Filter

    Got a standard 2015 ST tdci, worth changing air filter to K&N or not? Cheers

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  2. AndroidiOSWP's Avatar

    AndroidiOSWP said:
    I got the green filter and it just added noise. I know many like it but I prefer quiet. I'm back to oem.
  3. 2POINT0's Avatar

    2POINT0 said:
    Most people just get an aftermarket filter for the noise. The OEM paper filter actually filters quite well, but an aftermarket filter will allow you to hear induction sounds and the bypass valve.